JUST THE MATHS SLIDES NUMBER 3.5. TRIGONOMETRY 5 (Trigonometric identities & wave-forms) A.J.Hobson

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1 JUST THE MATHS SLIDES NUMBER 3.5 TRIGONOMETRY 5 (Trigonometric identities & wave-forms by A.J.Hobson Trigonometric identities 3.5. Amplitude, wave-length, frequency and phase-angle

2 UNIT TRIGONOMETRY 5 TRIGONOMETRIC IDENTITIES AND WAVE-FORMS TRIGONOMETRIC IDENTITIES ILLUSTRATION Prove that cos θ + sin θ 1. Proof: y (x, y h O θ x cos θ = x h and sin θ = y h ; x + y = h ; x h + y = 1; h cos θ + sin θ 1. 1

3 Other Variations (a cos θ 1 sin θ; (rearrangement. (b sin θ 1 cos θ; (rearrangement. (c sec θ 1 + tan θ; (divide by cos θ. (d cosec θ 1 + cot θ; (divide by sin θ. Other Trigonometric Identities secθ 1 cos θ cosecθ 1 sin θ cot θ 1 tan θ cos θ + sin θ tan θ sec θ 1 + cot θ cosec θ sin(a + B sin A cos B + cos A sin B sin(a B sin A cos B cos A sin B cos(a + B cos A cos B sin A sin B cos(a B cos A cos B + sin A sin B tan A + tan B tan(a + B 1 tan A tan B

4 tan A tan B tan(a B 1 + tan A tan B sin A sin A cos A cos A cos A sin A 1 sin A cos A 1 sin A sin 1 A cos 1 A tan A tan A 1 tan A cos A cos 1 A sin1 A 1 sin 1 A cos 1 A 1 tan A tan 1 A 1 tan 1 A A + B sin A + sin B sin cos A + B sin A sin B cos sin A + B cos A + cos B cos cos A + B cos A cos B sin 3 sin A B A B A B A B

5 sin A cos B 1 [sin(a + B + sin(a B] cos A sin B 1 cos A cos B 1 [sin(a + B sin(a B] [cos(a + B + cos(a B] sin A sin B 1 [cos(a B cos(a + B] sin 3A 3 sin A 4sin 3 A cos 3A 4cos 3 A 3 cos A EXAMPLES 1. Show that sin x 1 (1 cos 4x. cos 4x 1 sin x.. Show that π sin θ + cos θ. The left hand side can be expanded as sin θ cos π + cos θ sin π ; The result follows, because cos π = 0 and sin π = 1. 4

6 3. Simplify the expression sin α + sin 3α cos α cos 3α. Expression becomes sin ( α+3α sin ( α+3α. cos ( α 3α. sin ( α 3α sin ( ( 5α. cos α sin ( ( 5α. sin α cos ( α sin ( α cot α 4. Express sin 3x cos 7x as the difference of two sines. Hence,. sin 3x cos 7x sin(3x + 7x + sin(3x 7x. sin 3x cos 7x sin 10x sin 4x. 5

7 3.5. AMPLITUDE, WAVE-LENGTH, FREQUENCY AND PHASE ANGLE Importance is attached to trigonometric functions of the form A sin(ωt + α and A cos(ωt + α, where A, ω and α are constants and t is usually a time variable. The expanded forms are and A sin(ωt + α A sin ωt cos α + A cos ωt sin α A cos(ωt + α A cos ωt cos α A sin ωt sin α. (a The Amplitude A, represents the maximum value (numerically which can be attained by each of the above trigonometric functions. A is called the amplitude of each of the functions. 6

8 (b The Wave Length (Or Period If t increases or decreases by a whole multiple of π ω, then (ωt + α increases or decreases by a whole multiple of π; and hence the functions remain unchanged in value. A graph, against t, of either A sin(ωt + α or A cos(ωt + α would be repeated in shape at regular intervals of length π ω. The repeated shape of the graph is called the wave profile and π ω is called the wave-length, or period of each of the functions. (c The Frequency If t is a time variable, then the wave length (or period represents the time taken to complete a single wave-profile. Consequently, the number of wave-profiles completed in one unit of time is given by ω π. ω π is called the frequency of each of the functions. Note: ω is called the angular frequency ; 7

9 ω represents the change in the quantity (ωt+α for every unit of change in the value of t. (d The Phase Angle α affects the starting value, at t = 0, of the trigonometric functions A sin(ωt + α and A cos(ωt + α. Each of these is said to be out of phase, by an amount, α, with the trigonometric functions A sin ωt and A cos ωt respectively. α is called the phase angle of each of the two original trigonometric functions; it can take infinitely many values differing only by a whole multiple of 360 or π. EXAMPLES 1. Express sin t + 3 cos t in the form A sin(t + α, with α in degrees, and hence solve the equation, sin t + 3 cos t = 1, for t in the range 0 t 360. We require that sin t + 3 cos t A sin t cos α + A cos t sin α 8

10 Hence, A cos α = 1 and A sin α = 3, which gives A = 4 (using cos α+sin α 1 and also tan α = 3. Thus, A = and α = 60 (principal value. To solve the given equation, we may now use so that sin(t + 60 = 1, t + 60 = Sin 11 = 30 + k360 or k360, where k may be any integer. For the range 0 t 360, we conclude that t = 330 or 90. 9

11 . Express a sin ωt + b cos ωt in the form A sin(ωt + α. Apply the result to the expression 3 sin 5t 4 cos 5t stating α in degrees, correct to one decimal place, and lying in the interval from 180 to 180. A sin(ωt + α a sin ωt + b cos ωt; A sin α = b and A cos α = a; A = a + b ; A = a + b. Also A sin α A cos α = b a ; α = tan 1 b a. 10

12 Note: The particular angle chosen must ensure that sin α = b A and cos α = a A have the correct sign. For 3 sin 5t 4 cos 5t, we have A = and α = tan But sin α ( = 4 ( 5 and cos α = 3 5 so that 90 < α < 0; that is α = We conclude that 3 sin 5t 4 cos 5t 5 sin(5t

13 3. Solve the equation 4 sin t + 3 cos t = 1 for t in the interval from 180 to 180. Expressing the left hand side of the equation in the form A sin(t + α, we require A = = 5 and α = tan Also sin α ( = 3 ( 5 and cos α = 4 5 so that 0 < α < 90. Hence, α = and 5 sin(t = 1. t = 1 Sin Sin 11 5 = k360 and k360, where k may be any integer. But, for t values which are numerically less than 180, we use k = 0 and k = 1 in the first and k = 0 and k = 1 in the second. t = 1.67, 65.80, and

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